Begun, the airline tablet wars have? Microsoft's Surface Pro 2 has just joined the iPad on the FAA's list of approved pilot EFBs (Electronic Flight Bags) for all phases of flight. That follows Delta's recent announcement that it would deploy 11,000 of Redmond's hybrid tablets in its cockpits instead of the iPad, which it also considered. Apple's tablet is already used by American Airlines and others, but Delta said it preferred the readability, productivity apps and other features of the Surface Pro 2. Pilots will now be able to switch from heavy paper charts and books, which Delta said would save millions in fuel costs once the transition is complete in 2015.